Timber-drawing appliance



Feb. 23', 1926. 1,574,624

'Y T. GREAvEs ET AL TIMBER DRAWING APPLIANCE Filed Nov. 28, 1923 2 Sheets-Sheet Patented Feb. 23,1926.

UNITED STATES ra'rEN'r orifice.

THOMAS GREAVES, WILLIAM HENRY DARBOURNE, AND VINCENT WARNER, OF MANS- FIELD, ENGLAND, ASSIGNORS T0 THE LITTLEJ'ACK ENGINEERING GO. LIMITE-D, OF MANSFIEID, ENGLAND, A COMPANY REGISTERED UNDER THE LAWS OF GREAT BRITAIN.

Application led November 28, 1923.

To all 'whom t may concern:

lie it known that we, THoMAs GnnAvEs, VrLLniM HENRY BAnnoUnNn, and VINCENT IVARNER, all subjects of the King of Great Britain and Ireland, and residents of Manslield, Nottinghamshire, England, have invented certain new and useiul Improvements in Timber-Drawing Appliances (for which we have obtained a patent in Great Britain No. 195,823, dated 12th December, 1922), of which the following is a specification.

This invention relates to timber drawing appliances, and has fory its object to provide an improved appliance to be used in the speedy and effective handling of timber pitprops in mines and the like places. It relates to the known type of apparatus worked on the ratchet and free-wheel principle, wherein there is employed a drum constructed to positively engage a chain in nonslipping manner, and controlled in its movements by a ratchet wheel capable of rotation step-by-step by means of the to-and-fro movement of a pivoted handle carrying a pawl, and is retained against backward movement by a stop pawl which is capable of being put out of operation at will to tree the drum. In operation, such appliances are anchored to the ground or a convenient fixture by ashackle or the like, and the chain extending from the pit timber to be drawn passes around the drum and suitabl-e guides, and a pull exerted by slowly winding by means of the ratchet handle, the appliance generally (according to the height of pull) assuming an inclined position away from the ground according to the Igeneral inclination of the chain.

The present invention consists of a geared machine of the foregoing type, that is to say, wherein the ratchet wheel does not drive the chain drum by a one-to-one movement but is constructed to drive a pinion meshing with a gear wheel fast with the chain drum.

In one form, the chain drum is formed with an internally toothed spur wheel inside which can rotate the pinion, the latter being tast with the ratchet wheel.

To render the invention clear, the latter embodiment will be described, and is illus- Serial No. 677,475.

trated by the accompanying drawings, wherein Figure l. is a side view, side plate removed, .looking in direction of Arrow A (Figure 2) Figure 2 is an end sectional elevation, on line 2-2 Figure l);

Figure 3 is a side elevation on line 3-3 (Figure 2) and,

Figure l is a` plan view.

Rei'crring to the drawings, instead of pivoting the handle cl about the shaft Oi the drum l), as is the usual practice, there is employed a countershaft g carrying the handle pivot and ratchet separate from the drum 72,' the ratchet in the form illustrated is termed on one end of the barrel of a pinion which meshes with teeth on the drum 7), by which compounded gear an easier leveris obtained.

rIhe drum Z; is mounted between side plates aV and is Formed with a1 hollow cylindrical extension m interiorly toothed at a. @ne side plate a has a portion al inwardly ofliset and trough-shaped (see Figures 2 and 3), and an extra bearing plate a2 is bolted to u. so that a pinion chamber ois formed to house the pinion p which is mounted on the shaft carrying the operating handle d. The pinion meshes with the teeth n formed on the interiorv of the cylindrical extension m, and at the exterior of the pinion barrel ratchet teeth c1 are formed which are engaged by pawl el of the handle. A stop pawl g1 is pivoted at h.

In operation, the step-to-step rotation of the ratchet and pinion barrel (o1, p) is communicated to the chain drum b through the gear a. It will be seen that the strap di of the handle is recessed at d2 to clear the pawl g1; and to free the device so that chain can wind, -or unwind, the actuating pawl e1 .is pulled up and, by half a turn, held up, and the handle pulled right back till the end wall of the recess d2 engages and pushes away the stop pawl g1. Chain can be paid out while the handle is so held down. To prevent inadvertent freeing of pawl g1, a removable transverse pin or equivalent can be passed between the plates a to limit the backward movement of the handle (l` 7" is a bent bar to prevent the chain wrapping around the underside of the drum. Z), which latter is suitably formed as at z' to make a chain grip, Suitable chain guides, such as rollers 7c, are provided, and Z is any suitable shackle eye.

lVe claim l. A timber drawing appliance of A the class described, comprising a pair of side plates, an inwardly directed supporting member upon the inner side of one of said plates, a bearing plate upon the outer side of said plate, a main shaft mounted in said supporting member and the other of said side plates, a counter-shaft mounted in said supporting member and said bearing plate, an anti-slip chain drum upon said main shaft, an interiorly toothed hollow cylindrical extension upon one side of said -chain drum, a pinion barrel upon said eountershaft provided with teeth for meshing with the teeth 0f said hollow extension, ratchet teeth upon one side of said pinion barrel, a springpressed stop pawl for engaging said ratchet teeth, an operating handle having a recessed strap surrounding said ratchet teeth, and an actuatingl pawl carried by said strap for engaging said ratchet teeth for rotating said pinion barrel and said chain drum for winding said chain. v

2. A timber drawing appliance of the class described, comprising` a pair of side plates, an inwardly directed supporting member upon the inner side of one of said plates, a bearing plate upon the outer side of said plate, a main shaft mounted in said supporting member and the other of said side plates, a counter-shaft mounted in said supporting member and said bearing plate, an anti-slip chain drum upon said main shaft, an interiorly toothed hollow cylindrical extension upon one side of said chain drum, a pinion barrel upon said countershaft provided with teeth for meshing with the teeth of said hollow extension, ratchet teeth upon one side of said pinion barrel, a spring-pressed stop pawl for engaging said ratchet teeth, an operating handle having a recessed strap surrounding said ratchet teeth, and an aetuating pawl carried by said strap for engaging said ratchet teeth for rotating said pinion barrel and said chain drum for winding said chain, said actuating pawl being,r capable of being locked in withdrawn inoperative position, whereby upon further movement of said handle one end wall of the recess of said strap will contact with the locking pawl to cause the same to become disengaged from the ratchet teeth to permit the retrograde movement of said chain drum for paying out said chain.

timber drawing appliance of the class described, comprising a pair of side plates, an inwardly directed supporting member upon the inner side of one of said plates, a bearing plate upon the outer side of said plate, a main shaft mounted in said supporting member and the other of said side plates, a counter-shaft mounted in said supporting member and said bearing plate, an anti-slip chain drum upon said main shaft, an interiorly toothed hollow cylindrical extension upon one side of said chain drum, a pinion barrel upon said countershaft provided with teeth for meshing with the teeth of said hollow extension, ratchet teeth upon one side of said pinion barrel, a spring-pressed stop pawl for engaging said ratchet teeth, an operating handle having a recessed strap surrounding said ratchet teeth, and a guard member upon said chain drum for preventing the overwinding and overlapping of the chain upon said drum.

In testimony whereof we have aiiixed our signatures hereto this 12th day of November, 1923.

THOMAS GREAVES.

VILLIAM HENRY DARBOURNE.

VINCENT WARNER. 

